CN112379165B - Current phase detection and adjustment circuit and current phase adjustment method - Google Patents
Current phase detection and adjustment circuit and current phase adjustment method Download PDFInfo
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- CN112379165B CN112379165B CN202011110469.2A CN202011110469A CN112379165B CN 112379165 B CN112379165 B CN 112379165B CN 202011110469 A CN202011110469 A CN 202011110469A CN 112379165 B CN112379165 B CN 112379165B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
- G01R25/04—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents involving adjustment of a phase shifter to produce a predetermined phase difference, e.g. zero difference
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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Abstract
The application relates to a current phase detection and adjustment circuit and a current phase adjustment method, wherein a switching circuit is used for converting input direct-current voltage into alternating-current voltage and then outputting the alternating-current voltage; the isolation boosting energy storage unit is connected with the switch circuit, is used for converting the received alternating voltage into secondary side detection current and then outputting the secondary side detection current, and is also used for storing energy based on the received alternating voltage and providing energy for a load; the shaping circuit is connected with the isolation boosting energy storage unit and is used for converting the received secondary side detection current into detection current and outputting the detection current; the control circuit is connected with the shaping circuit and used for receiving the detection current, acquiring the current of the load and acquiring the phase difference between the detection current and the current. The method and the device can accurately detect the current phase of the load under the conditions of small load current and no load.
Description
Technical Field
The present invention relates to the field of power electronics technologies, and in particular, to a current phase detection and adjustment circuit and a current phase adjustment method.
Background
The piezoelectric ceramic transducer is a device for realizing mutual conversion between electric energy and sound energy by using a piezoelectric effect, structural components of the piezoelectric ceramic transducer comprise a central piezoelectric ceramic element, front and rear metal cover plates, a prestressed screw, an electrode plate, an insulating tube and the like, and the sandwich transducer or the bolt fastening transducer generates stable ultrasonic waves when the load changes, so that the method is a main method for obtaining a power ultrasonic driving source.
However, in the conventional current phase detection circuit, a current transformer wound by a magnetic ring is adopted, when the current is relatively small, the signal of the current is distorted, and the current phase cannot be detected particularly in no-load. Therefore, a technique for accurately detecting the current phase of the load under the condition of small load current and no load is needed.
Disclosure of Invention
In view of the above, it is desirable to provide a current phase detecting and adjusting circuit and a current phase adjusting method, which can accurately detect the current phase of a load when the load current is small and no load.
To achieve the above and other objects, a first aspect of the present application provides a current phase detecting circuit comprising:
the switching circuit is used for converting the input direct-current voltage into alternating-current voltage and then outputting the alternating-current voltage;
the isolation boosting energy storage unit is connected with the switch circuit and used for receiving the alternating voltage and generating boosting alternating current and secondary side detection current according to the alternating voltage, wherein the boosting alternating current is used for providing electric energy for a load;
the shaping circuit is connected with the isolation boosting energy storage unit and used for receiving the secondary side detection current and generating a phase detection current according to the secondary side detection current;
and the control circuit is connected with the shaping circuit and used for receiving the phase detection current, acquiring the voltage phase of the load and acquiring the phase difference between the current phase and the voltage phase of the phase detection current.
In the current phase detection circuit in the above embodiment, a switching circuit is provided to convert an input dc voltage into an ac voltage and output the ac voltage; the isolation boosting energy storage unit is used for receiving the alternating voltage, converting the alternating voltage into secondary side detection current and outputting the secondary side detection current, and the isolation boosting energy storage unit is used for storing energy based on the received alternating voltage so as to provide boosting alternating current for a load; a shaping circuit is arranged to be connected with the isolation boosting energy storage unit and used for converting the received secondary side detection current into phase detection current and outputting the phase detection current; and enabling a control circuit connected with the shaping circuit to calculate the phase difference according to the acquired current phase of the phase detection current and the voltage phase of the load. Because the isolation boosting energy storage unit can store energy based on the received alternating voltage and provide boosting alternating current for the load, when the load is in the condition of small current or no load, the isolation boosting energy storage unit supplies energy to the load, and the current phase of the load can be accurately detected under the condition of small current and no load.
In one embodiment, the isolation boosting energy storage unit comprises a transformer and a capacitive energy storage unit;
the primary winding of the transformer is connected with the output end of the switching circuit;
the first end of the first secondary winding of the transformer is used for being connected with the load, and the second end of the first secondary winding is connected with the load and the ground through the capacitive energy storage unit;
and a first end of a second secondary winding of the transformer is connected with the input end of the shaping circuit, and a second end of the second secondary winding is connected with the load and the ground through the capacitive energy storage unit.
In the current phase detection circuit in the above embodiment, by setting the second end of the first secondary winding of the transformer to be connected to both the load and the ground through the capacitive energy storage unit, the capacitive energy storage unit stores energy based on the received ac voltage and provides boosted ac power to the load, and when the load is in a condition of a small or no current, the energy provided by the capacitive energy storage unit to the load and the induced voltage of the second secondary winding of the transformer are superimposed together to generate a regular sine wave, so that the control circuit can accurately detect the current phase of the load. In one embodiment, the isolated boost energy storage unit further includes an inductive energy storage unit, a first end of the inductive energy storage unit is connected to a first end of the first secondary winding, a second end of the inductive energy storage unit is used for being connected to the load, and the inductive energy storage unit is used for forming a resonant circuit with an internal capacitor of the load.
In one embodiment, the isolated boost energy storage unit further includes a discharge resistor, and the first end of the second secondary winding is grounded via the discharge resistor. When the induction voltage exists in the second secondary winding, the induction voltage can be discharged through the discharge resistor to consume energy, and the induction voltage is prevented from generating adverse effects on the transformer winding.
In one embodiment, the current phase detection circuit further includes a lagging phase-shifting circuit, a first end of the lagging phase-shifting circuit is connected with a first end of the second secondary winding, a second end of the lagging phase-shifting circuit is connected with an input end of the shaping circuit, a third end of the lagging phase-shifting circuit is grounded, and the lagging phase-shifting circuit is configured to receive the secondary detection current and generate a preset phase delay for the secondary detection current to match a delay that may be generated by a functional module in the circuit, so as to improve accuracy of current phase detection in the present application.
In one embodiment, the hysteretic phase shift circuit comprises:
a first end of the shift resistor is connected with a first end of the second secondary winding;
and the first end of the moving capacitor is connected with the second end of the moving resistor, and the second end of the moving capacitor is grounded.
In one embodiment, the hysteretic phase shift circuit further comprises:
a first voltage clamping diode, wherein the anode of the first voltage clamping diode is connected with the second end of the shift resistor, and the cathode of the first voltage clamping diode is connected with the output end of the first direct current power supply;
a second voltage clamping diode having a cathode connected to the second end of the moving resistor and an anode connected to ground.
In one embodiment, the current phase detection circuit further includes a dc blocking current limiting unit, which is connected in series between the input terminal of the shaping circuit and the first terminal of the second secondary winding, and is configured to isolate dc current and enable the amplitude of the current received by the shaping circuit to be within a preset current threshold range.
In one embodiment, the dc blocking current limiting unit includes:
a first end of the blocking capacitor is connected with a first end of the second secondary winding;
and the first end of the current-limiting resistor is connected with the second end of the blocking capacitor, and the second end of the current-limiting resistor is connected with the input end of the shaping circuit.
In one embodiment, the shaping circuit comprises:
a positive input end of the comparator is connected with the first end of the second secondary winding, and an output end of the comparator is used for being connected with an input end of the control circuit;
the first voltage division circuit is connected with the positive input end of the comparator and used for providing a first driving current and a first driving voltage for the positive input end of the comparator;
and the second voltage division circuit is connected with the negative input end of the comparator and used for providing a second driving current and a second driving voltage for the negative input end of the comparator, wherein the first driving current is smaller than the second driving current, and the first driving voltage is equal to the second driving voltage.
In the current phase detection circuit in the above embodiment, the comparator is arranged to convert the sine wave or similar sine wave signal in the received secondary side detection current into the phase detection current, such as a square wave signal, and output the phase detection current, so as to improve the accuracy of the current phase obtained by the subsequent control circuit based on the obtained phase detection current and the load voltage phase.
In one embodiment, the switching circuit includes:
a first upper bridge arm switch unit, a first end of which is connected with the direct current voltage;
the first end of the first lower bridge arm switch unit is connected with the second end of the first upper bridge arm switch unit and the first input end of the isolation boosting energy storage unit, and the second end of the first lower bridge arm switch unit is grounded;
a second upper bridge arm switch unit, a first end of the second upper bridge arm switch unit being connected to a first end of the first upper bridge arm switch unit;
and a first end of the second lower bridge arm switch unit is connected with a second end of the second upper bridge arm switch unit and a second input end of the isolation boosting energy storage unit, and a second end of the second lower bridge arm switch unit is connected with a second end of the first lower bridge arm switch unit.
In the current phase detection circuit in the above embodiment, by controlling the switching frequency of each switching tube in the first upper bridge arm switching unit, the first lower bridge arm switching unit, the second upper bridge arm switching unit, and the second lower bridge arm switching unit, parameters such as amplitude, period, or phase of the ac voltage output by the switching circuit can be changed, so as to meet different requirements of different loads and different test circuits on current phase detection.
A second aspect of the present application provides a current phase adjustment circuit for adjusting a current phase of a load, comprising a current phase detection circuit as described in any of the embodiments of the present application, the control circuit being configured to:
if the current phase of the phase detection current is ahead of the voltage phase, controlling to increase the switching frequency of the switching circuit;
and if the current phase of the phase detection current lags behind the voltage phase, controlling to reduce the switching frequency of the switching circuit.
A third aspect of the present application provides a current phase adjustment method, including:
acquiring a current phase of a phase detection current and a voltage phase of a load based on a current phase detection circuit in any embodiment of the application;
if the current phase of the phase detection current is ahead of the voltage phase, controlling to increase the switching frequency of the switching circuit;
and if the current phase of the phase detection current lags behind the voltage phase, controlling to reduce the switching frequency of the switching circuit.
In the current phase adjustment method in the above embodiment, the input dc voltage is converted into the ac voltage based on the switching circuit in the current phase detection circuit and then output; receiving the alternating voltage by using an isolation boosting energy storage unit in a current phase detection circuit, converting the alternating voltage into secondary side detection current and outputting the secondary side detection current, and storing energy based on the received alternating voltage by using the isolation boosting energy storage unit so as to provide boosting alternating current for a load; and a shaping circuit is arranged to be connected with the isolation boosting energy storage unit and used for converting the received secondary side detection current into a phase detection current and then outputting the phase detection current, so that a control circuit connected with the shaping circuit calculates a phase difference according to the obtained phase detection current and the voltage phase of the load. Because the isolation boosting energy storage unit can store energy based on the received alternating voltage and provide boosting alternating current for the load, when the load is in the condition of small current or no load, the isolation boosting energy storage unit supplies energy to the load, so that the current phase of the load can be accurately detected under the condition of small current or no load, the switching frequency of each switching tube in the switching circuit is adjusted based on the detection result of the current phase of the load, and the regulation and control requirements on the current phases of different circuits are met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain drawings of other embodiments based on these drawings without any creative effort.
Fig. 1 is a schematic circuit diagram of a current phase detection circuit according to a first embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a current phase detection circuit according to a second embodiment of the present application;
fig. 3 is a schematic circuit diagram of a current phase detection circuit according to a third embodiment of the present application;
fig. 4 is a schematic circuit diagram of a current phase detection circuit provided in a fourth embodiment of the present application;
fig. 5 is a schematic circuit diagram of a current phase detection circuit provided in a fifth embodiment of the present application;
fig. 6 is a schematic circuit diagram of a current phase detection circuit provided in a sixth embodiment of the present application;
fig. 7 is a schematic circuit diagram of a current phase detection circuit provided in a seventh embodiment of the present application;
fig. 8 is a schematic circuit diagram of a current phase detection circuit according to an eighth embodiment of the present application;
fig. 9 is a schematic circuit diagram of a current phase detection circuit provided in a ninth embodiment of the present application;
fig. 10 is a circuit schematic diagram of a current phase detection circuit provided in a tenth embodiment of the present application;
fig. 11 is a schematic circuit diagram of a current phase adjustment circuit according to an eleventh embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.
In this application, unless otherwise expressly stated or limited, the terms "connected" and "connecting" are used broadly and encompass, for example, direct connection, indirect connection via an intermediary, communication between two elements, or interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1, in an embodiment of the present application, a current phase detection circuit 100 is provided, which includes a switch circuit 10, an isolation boost energy storage unit 20, a shaping circuit 30 and a control circuit 40, wherein the switch circuit 10 is configured to convert an input dc voltage into an ac voltage and output the ac voltage; the isolation boosting energy storage unit 20 is connected with the switch circuit 10, and is used for receiving the alternating voltage, converting the alternating voltage into secondary side detection current and outputting the secondary side detection current; the isolated boost energy storage unit 20 is further configured to store energy based on the received ac voltage and provide a boost ac power to the load 200; the shaping circuit 30 is connected to the isolated boost energy storage unit 20, and is configured to receive the secondary side detection current and generate a phase detection current according to the secondary side detection current; the control circuit 40 is connected to the shaping circuit 30, and is configured to receive the phase detection current, obtain a voltage phase of the load 200, and obtain a phase difference between a current phase and the voltage phase of the phase detection current.
Specifically, please refer to fig. 1, the switch circuit 10 is configured to convert the input dc voltage into an ac voltage and output the ac voltage, for example, the input bus dc voltage may be converted into a square wave voltage through the switch circuit 10; the isolation boosting energy storage unit 20 is used for receiving the alternating voltage, converting the alternating voltage into secondary side detection current and outputting the secondary side detection current, and the isolation boosting energy storage unit 20 is used for storing energy based on the received alternating voltage so as to provide boosting alternating current for the load 200, so that a high-voltage power supply load such as a piezoelectric ceramic transducer can work normally; the shaping circuit 30 is connected with the isolation boosting energy storage unit 20 and is used for converting the received secondary side detection current into a phase detection current and outputting the phase detection current; so that the control circuit 40 connected to the shaping circuit 30 calculates a phase difference from the acquired phase detection current and load voltage phase. Because the isolated boost energy storage unit 20 can store energy based on the received alternating voltage and provide boost alternating current for the load 200, when the load 200 is in a condition of small current or no load, the electric energy stored in the isolated boost energy storage unit supplies power to the load 200, and the current phase of the load 200 can be accurately detected under the condition of small load current and no load.
Further, referring to fig. 2, in an embodiment of the present application, the isolation boost energy storage unit 20 includes a transformer (not shown in fig. 2) and a capacitive energy storage unit 24; the primary winding 21 of the transformer is connected with the output end of the switch circuit 10; the output end of the first secondary winding 22 of the transformer is used for being connected with a load 200, wherein the second end of the first secondary winding 22 is connected with the load 200 and the ground through a capacitive energy storage unit 24; a first end of a second secondary winding 23 of the transformer is connected to an input end of the shaping circuit 30, and a second end of the second secondary winding 23 is connected to both the load 200 and ground through the capacitive energy storage unit 24.
Specifically, with continued reference to fig. 2, by providing that the second end of the first secondary winding 22 is connected to both the load 200 and the ground through the capacitive energy storage unit 24, the capacitive energy storage unit 24 stores energy based on the received ac voltage and provides the boosted ac power to the load 200. The capacitive energy storage unit 24 enables the power supply loop of the load 200 to form a path and filter in an alternating current state, and forms a certain voltage drop and stores energy when the loop current is large. When the load 200 is in a condition of a small current or no load, the energy provided by the capacitive energy storage unit 24 to the load 200 is superimposed with the induced voltage of the second secondary winding 23 of the transformer and generates a regular sine wave, so that the control circuit 40 can accurately detect the current phase of the load 200.
In an embodiment of the present application, the load 200 may be a piezoelectric ceramic transducer, and the capacitive energy storage unit 24 may be a capacitor, where the capacitor enables a power supply loop of the piezoelectric ceramic transducer to form a path and filter in an alternating current state, and form a voltage drop with a certain amplitude and store energy when a loop current is large, so as to overlap with an induced voltage of the second secondary winding 23 of the transformer under a condition that a current of the piezoelectric ceramic transducer is small or no-load, and provide regular sine wave alternating current to the piezoelectric ceramic transducer together, so as to implement accurate detection of a current phase of the piezoelectric ceramic transducer.
Further, referring to fig. 3, in an embodiment of the present application, the isolated boost energy storage unit 20 further includes an inductive energy storage unit 25, a first end of the inductive energy storage unit 25 is connected to a first end of the first secondary winding 22, a second end of the inductive energy storage unit 25 is configured to be connected to the load 200, and the inductive energy storage unit 25 is configured to form a resonant circuit with an internal capacitor of the load 200, for example, the resonant circuit may be formed with an internal capacitor of a piezoceramic transducer. In one embodiment of the present application, the inductive energy storage unit 25 may be an inductor.
Further, referring to fig. 4, in an embodiment of the present application, the isolated boost energy storage unit 20 further includes a discharge resistor R1, a first end of the discharge resistor R1 is connected to a first end of the second secondary winding 23, and a second end of the discharge resistor R1 is grounded. When the induced voltage exists in the second secondary winding 23, the induced voltage can be discharged through the discharge resistor R1 to consume energy, and the induced voltage is prevented from generating adverse effects on the transformer winding.
Further, referring to fig. 5, in an embodiment of the present application, the current phase detecting circuit 100 further includes a lagging phase-shifting circuit 50, a first end of the lagging phase-shifting circuit 50 is connected to a first end of the second secondary winding 23 of the transformer, a second end of the lagging phase-shifting circuit 50 is connected to an input end of the shaping circuit 30, a third end of the lagging phase-shifting circuit 50 is connected to ground, and the lagging phase-shifting circuit 50 is configured to receive the secondary detection current and generate a predetermined phase delay for the secondary detection current, so as to match a delay that may be generated by a functional module in the circuit, so as to improve accuracy of current phase detection in the present application.
Further, referring to fig. 6, in an embodiment of the present application, the hysteretic phase shift circuit 50 includes a shift resistor R2 and a shift capacitor C3, the shift resistor R2 is connected in series between the first end of the second secondary winding 23 of the transformer and the input end of the shaping circuit 30; one end of the shift capacitor C3 is connected to the output end of the shift resistor R2, and the other end of the shift capacitor C3 is grounded. The phase delay generated by the hysteretic phase shift circuit 50 is adjusted by setting parameters of the shift resistor R2 and the shift capacitor C3 to match the delays that may be generated by other functional blocks in the circuit, thereby improving the accuracy of current phase detection in the present application.
Further, referring to fig. 7, in an embodiment of the present application, the hysteretic phase shift circuit 50 further includes a first voltage-clamping diode D1 and a second voltage-clamping diode D2, an anode of the first voltage-clamping diode D1 is connected to the second end of the shift resistor R2, and a cathode of the first voltage-clamping diode D1 is connected to the output terminal of the first dc power supply VDD 1; the cathode of the second voltage clamp diode D2 is connected to the second terminal of the shunt resistor R2, and the anode of the second voltage clamp diode D2 is connected to ground. For example, in one embodiment of the present application, the voltage amplitude of the signal received by the shaping circuit 30 is greater than or equal to-15V and less than or equal to 15V by setting the conduction voltage drops of the first voltage-clamping diode D1 and the second voltage-clamping diode D2.
Further, referring to fig. 8, in an embodiment of the present application, the current phase detecting circuit 100 further includes a dc blocking and current limiting unit 60, where the dc blocking and current limiting unit 60 is connected in series between the input terminal of the shaping circuit 30 and the first end of the second secondary winding 23 of the transformer, and is used for isolating direct current and making the magnitude of the current received by the shaping circuit 30 be within a preset current threshold range, so as to meet the power supply requirement of the shaping circuit 30.
Further, referring to fig. 9, in an embodiment of the present application, the dc blocking and current limiting unit 60 includes a dc blocking capacitor C4 and a current limiting resistor R3, wherein a first end of the dc blocking capacitor C4 is connected to a first end of the second secondary winding 23; a first terminal of the current limiting resistor R3 is connected to a second terminal of the dc blocking capacitor C4, and a second terminal of the current limiting resistor R3 is connected to an input terminal of the shaping circuit 30.
Further, referring to fig. 10, in an embodiment of the present application, the shaping circuit 30 includes a comparator U2, a first voltage dividing circuit 31 and a second voltage dividing circuit 32, a positive input terminal of the comparator U2 is connected to the first terminal of the second secondary winding 23 of the transformer, and an output terminal of the comparator U2 is used for being connected to an input terminal of the control circuit (not shown in fig. 10); the output end of the first voltage dividing circuit 31 is connected to the positive input end of the comparator U2, and is configured to provide a first driving current and a first driving voltage to the positive input end of the comparator U2; the output end of the second voltage division circuit 32 is connected to the negative input end of the comparator U2, and is configured to provide a second driving current and a second driving voltage to the negative input end of the comparator U2, where the first driving current is smaller than the second driving current, and the first driving voltage is equal to the second driving voltage.
As shown in fig. 10, the first voltage dividing circuit 31 may include a resistor R6 and a resistor R7, a first end of the resistor R6 is connected to a 15V dc power supply, a second end of the resistor R6 is connected to the positive input end of the comparator U2, a first end of the resistor R7 is connected to a second end of the resistor R6, a second end of the resistor R7 is grounded, the resistors R6 and R7 are both 100K Ω, and a second end of the resistor R6 provides a 7.5V voltage and a 0.075mA current to the positive input end of the comparator U2; the second voltage divider circuit 32 may include a resistor R5 and a resistor R4, a first end of the resistor R5 is connected to a 15V dc power supply, a second end of the resistor R5 is connected to a negative input terminal of the comparator U2, a first end of the resistor R4 is connected to a second end of the resistor R5, a second end of the resistor R4 is grounded, the resistors R4 and R5 are both 10K Ω, and a second end of the resistor R5 provides a 7.5V voltage and a 0.75mA current to the negative input terminal of the comparator U2. The output of the comparator U2 is connected to a 15V DC power supply via a pull-up resistor R8. The shaping circuit 30 shapes the sine wave or a similar sine wave into a square wave, which is output to the netPort3 for supply to the control circuit.
Further, please refer to fig. 10 again, in an embodiment of the present application, the switch circuit 10 includes a first upper bridge arm switch unit 11, a first lower bridge arm switch unit 12, a second upper bridge arm switch unit 13, and a second lower bridge arm switch unit 14, wherein a first end of the first upper bridge arm switch unit 11 is connected to the dc voltage Vbus; a first end of the first lower bridge arm switch unit 12 is connected with a second end of the first upper bridge arm switch unit 11 and a first input end of the isolation boosting energy storage unit 20, and a second end of the first lower bridge arm switch unit 12 is grounded; a first end of the second upper arm switch unit 13 is connected with a first end of the first upper arm switch unit 11; a first end of the second lower bridge arm switch unit 14 is connected to a second end of the second upper bridge arm switch unit 13 and a second input end of the isolation boost energy storage unit 20, and a second end of the second lower bridge arm switch unit 14 is connected to a second end of the first lower bridge arm switch unit 12.
Specifically, with continued reference to fig. 10, the first upper arm switch unit 11 includes an Insulated Gate Bipolar Transistor (IGBT) Q1, the first lower arm switch unit 12 includes an IGBT Q2, the second upper arm switch unit 13 includes an IGBT Q3, the second lower arm switch unit 14 includes an IGBT Q4, and a collector of the IGBT Q1 is connected to the dc voltage Vbus; the collector of the IGBT Q2 is connected with the emitter of the IGBT Q1 and the first input end of the isolated boosting energy storage unit 20, and the emitter of the IGBT Q2 is grounded; the collector of the IGBT Q3 is connected to the collector of the IGBT Q1; the collector of the IGBT Q4 is connected with the emitter of the IGBT Q3 and the second input end of the isolated boost energy storage unit 20, and the emitter of the IGBT Q4 is connected with the emitter of the IGBT Q2. The netPort1 and the netPort2 are used for connecting loads, such as piezoelectric ceramic transducers. The netPort3 is used to connect control circuits.
Specifically, with continued reference to fig. 10, by controlling the switching frequencies of the IGBT Q1, the IGBT Q2, the IGBT Q3, and the IGBT Q4, the amplitude, the period, or the phase of the ac voltage output by the switching circuit 10 can be changed to meet different requirements of different loads and different test circuits for current phase detection.
Referring to fig. 11, in an embodiment of the present application, a current phase adjusting circuit 300 is provided for adjusting a current phase of a load 200, including the current phase detecting circuit 100 as described in any of the embodiments of the present application, the control circuit 40 is configured to:
if the current phase of the phase detection current leads the voltage phase, controlling to increase the switching frequency of the switching circuit 10;
if the current phase of the phase detection current lags behind the voltage phase, the switching frequency of the switching circuit 10 is controlled to be reduced.
In one embodiment of the present application, a current phase adjustment method is provided, including:
acquiring a current phase of a phase detection current and a voltage phase of a load based on a current phase detection circuit in any embodiment of the application;
if the current phase of the phase detection current is ahead of the voltage phase, controlling to increase the switching frequency of the switching circuit;
and if the current phase of the phase detection current lags behind the voltage phase, controlling to reduce the switching frequency of the switching circuit.
In the current phase adjustment method in the above embodiment, a switching circuit in a current phase detection circuit is configured to convert an input dc voltage into an ac voltage and output the ac voltage; receiving the alternating voltage by using an isolation boosting energy storage unit in a current phase detection circuit, converting the alternating voltage into secondary side detection current and outputting the secondary side detection current, and storing energy based on the received alternating voltage by using the isolation boosting energy storage unit so as to provide boosting alternating current for a load; a shaping circuit in the current phase detection circuit is connected with the isolation boosting energy storage unit and used for converting the received secondary side detection current into phase detection current and outputting the phase detection current; and enabling a control circuit connected with the shaping circuit to calculate the phase difference according to the acquired current phase of the phase detection current and the voltage phase of the load. Because the isolation boosting energy storage unit can store energy based on the received alternating voltage and provide boosting alternating current for the load, when the load is in the condition of small current or no load, the isolation boosting energy storage unit supplies energy to the load, and the current phase of the load can be accurately detected under the condition of small current and no load. And adjusting the switching frequency of each switching tube in the switching circuit based on the detection result of the load current phase to meet the regulation and control requirements on the current phases of different circuits.
For specific limitations of the current phase adjustment method in the above embodiments, reference may be made to the limitations of the current phase detection circuit, which are not described herein again.
It should be understood that the steps described are not to be performed in the exact order recited, and that the steps may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps described may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or in alternation with other steps or at least some of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others.
It should be noted that the above-mentioned embodiments are only for illustrative purposes and are not meant to limit the present invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A current phase detection circuit (100), comprising:
a switching circuit (10) for converting an input DC voltage into an AC voltage and outputting the AC voltage;
the isolation boosting energy storage unit (20) is connected with the switching circuit (10) and is used for receiving the alternating voltage and generating boosting alternating current and secondary side detection current according to the alternating voltage, wherein the boosting alternating current is used for providing electric energy for a load (200);
the alternating voltage shaping circuit (30) is connected with the isolation boosting energy storage unit (20) and is used for receiving the secondary side detection current and generating a phase detection current according to the secondary side detection current;
a control circuit (40) connected to the shaping circuit (30) for receiving the phase detection current and obtaining a voltage phase of a load (200), and calculating a phase difference between the current phase and the voltage phase of the phase detection current; adjusting the switching frequency of each switching tube in the switching circuit (10) based on the phase difference to meet the regulation and control requirement on the current phase;
the isolation boosting energy storage unit (20) comprises a transformer and a capacitive energy storage unit (24), and a primary winding (21) of the transformer is connected with the output end of the switch circuit (10); a first end of a first secondary winding (22) of the transformer is used for being connected with the load (200), and a second end of the first secondary winding (22) is connected with the load (200) and the ground through the capacitive energy storage unit (24); a first end of a second secondary winding (23) of the transformer is connected with an input end of the shaping circuit (30), and a second end of the second secondary winding (23) is connected with the load (200) and the ground through the capacitive energy storage unit (24); the load (200) comprises a piezoelectric ceramic transducer.
2. The current phase detection circuit (100) of claim 1, wherein the capacitive energy storage unit (24) comprises a capacitor.
3. The current phase detection circuit (100) of claim 2, wherein the isolated boost energy storage unit (20) further comprises:
and a first end of the inductive energy storage unit (25) is connected with a first end of the first secondary winding (22), a second end of the inductive energy storage unit (25) is used for being connected with the load (200), and the inductive energy storage unit (25) is used for forming a resonant circuit with an internal capacitor of the load (200).
4. The current phase detection circuit (100) of claim 2, wherein the isolated boost energy storage unit (20) further comprises:
a discharge resistor (R1), a first end of the second secondary winding (23) being connected to ground via the discharge resistor (R1).
5. The current phase detection circuit (100) according to any one of claims 2-4, further comprising:
a lagging phase shift circuit (50), wherein a first end of the lagging phase shift circuit (50) is connected with a first end of the second secondary winding (23), a second end of the lagging phase shift circuit (50) is connected with an input end of the shaping circuit (30), and a third end of the lagging phase shift circuit (50) is grounded; the lagging phase-shifting circuit (50) is used for receiving the secondary side detection current and generating a preset phase delay for the secondary side detection current.
6. The current phase detection circuit (100) of claim 5, wherein the hysteretic phase shift circuit (50) comprises:
a moving resistor (R2), a first end of the moving resistor (R2) being connected to a first end of the second secondary winding (23);
a shift capacitor (C3), a first terminal of the shift capacitor (C3) is connected to a second terminal of the shift resistor (R2), and a second terminal of the shift capacitor (C3) is grounded.
7. The current phase detection circuit (100) of claim 6, wherein the hysteretic phase shift circuit (50) further comprises:
a first voltage-clamping diode (D1), an anode of the first voltage-clamping diode (D1) being connected to the second terminal of the shunt resistor (R2), a cathode of the first voltage-clamping diode (D1) being connected to the output terminal of a first DC power supply (VDD 1);
a second voltage clamping diode (D2), a cathode of the second voltage clamping diode (D2) being connected to the second end of the shunt resistor (R2), an anode of the second voltage clamping diode (D2) being connected to ground.
8. The current phase detection circuit (100) according to any one of claims 2-4, further comprising:
and the direct current blocking and limiting unit (60) is connected between the input end of the shaping circuit (30) and the first end of the second secondary winding (23) in series and is used for blocking direct current and enabling the amplitude of current received by the shaping circuit (30) to be within a preset current threshold range.
9. The current phase detection circuit (100) of claim 8, wherein the dc blocking current limiting unit (60) comprises:
a dc blocking capacitance (C4), a first end of the dc blocking capacitance (C4) being connected with a first end of the second secondary winding (23);
a current limiting resistor (R3), wherein a first end of the current limiting resistor (R3) is connected with a second end of the DC blocking capacitor (C4), and a second end of the current limiting resistor (R3) is connected with an input end of the shaping circuit (30).
10. The current phase detection circuit (100) according to any of claims 2-4, wherein the shaping circuit (30) comprises:
a comparator (U2), a positive input of the comparator (U2) being connected with a first end of the second secondary winding (23), an output of the comparator being for connection with an input of the control circuit;
a first voltage divider circuit (31) connected to the positive input terminal of the comparator (U2) for providing a first driving current and a first driving voltage to the positive input terminal of the comparator (U2);
and the second voltage division circuit (32) is connected with the negative input end of the comparator (U2) and is used for providing a second driving current and a second driving voltage for the negative input end of the comparator (U2), wherein the first driving current is smaller than the second driving current, and the first driving voltage is equal to the second driving voltage.
11. A current phase adjustment circuit (300) for adjusting a current phase of a load (200), comprising the current phase detection circuit (100) of any one of claims 1-10, the control circuit (40) being configured to:
if the current phase of the phase detection current is ahead of the voltage phase, controlling to increase the switching frequency of the switching circuit (10);
and if the current phase of the phase detection current lags behind the voltage phase, controlling to reduce the switching frequency of the switching circuit (10).
12. A method of current phase adjustment, comprising:
the current phase detection circuit (100) according to any one of claims 1 to 10, obtaining a current phase of the phase detection current and a voltage phase of the load (200);
if the current phase of the phase detection current is ahead of the voltage phase, controlling to increase the switching frequency of the switching circuit (10);
and if the current phase of the phase detection current lags behind the voltage phase, controlling to reduce the switching frequency of the switching circuit (10).
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585246A (en) * | 2003-08-23 | 2005-02-23 | 彭增金 | Step-down power supply for obtaining monoboard apparatus working power supply by loaded resistance |
| JP2009124844A (en) * | 2007-11-14 | 2009-06-04 | Renesas Technology Corp | Switching power supply |
| CN101980030A (en) * | 2010-11-10 | 2011-02-23 | 山东电力集团公司聊城供电公司 | Serial zero load current phase measuring instrument |
| KR20130103909A (en) * | 2012-03-12 | 2013-09-25 | 하이테콤시스템(주) | Power converter apparatus for applying to senserless type mppt control of wind power system |
| CN204131426U (en) * | 2013-12-04 | 2015-01-28 | 广东电网公司佛山供电局 | With the high-voltage pulse generator of phase-detection |
| CN110113037A (en) * | 2019-05-27 | 2019-08-09 | 深圳和而泰小家电智能科技有限公司 | Super-zero control circuit and electronic equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102298089B (en) * | 2010-11-26 | 2013-05-08 | 中国工程物理研究院流体物理研究所 | Novel phase difference detection circuit and method thereof |
| CN107659155B (en) * | 2017-08-10 | 2019-12-17 | 苏州汇川联合动力系统有限公司 | Bidirectional DC converter and bidirectional DC conversion control method |
-
2020
- 2020-10-16 CN CN202011110469.2A patent/CN112379165B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585246A (en) * | 2003-08-23 | 2005-02-23 | 彭增金 | Step-down power supply for obtaining monoboard apparatus working power supply by loaded resistance |
| JP2009124844A (en) * | 2007-11-14 | 2009-06-04 | Renesas Technology Corp | Switching power supply |
| CN101980030A (en) * | 2010-11-10 | 2011-02-23 | 山东电力集团公司聊城供电公司 | Serial zero load current phase measuring instrument |
| KR20130103909A (en) * | 2012-03-12 | 2013-09-25 | 하이테콤시스템(주) | Power converter apparatus for applying to senserless type mppt control of wind power system |
| CN204131426U (en) * | 2013-12-04 | 2015-01-28 | 广东电网公司佛山供电局 | With the high-voltage pulse generator of phase-detection |
| CN110113037A (en) * | 2019-05-27 | 2019-08-09 | 深圳和而泰小家电智能科技有限公司 | Super-zero control circuit and electronic equipment |
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